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3508FE Datasheet(PDF) 3 Page - Linear Technology |
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3508FE Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LT3508 3 3508fb ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBOOST = 17V unless otherwise noted. (Note 2) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3508E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3508I is guaranteed over the full –40°C to 125°C operating junction temperature range. The LT3508H is guaranteed over the full –40°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. Note 3: Current flows out of pin. Note 4: VBOOST =12V. Circuitry increases the maximum duty cycle of the LT3508 when VBOOST > VIN + 2.5V. See “Minimum Operating Voltage” in the Applications Information section for details. Note 5: Current limit is guaranteed by design and/or correlation to static test. Slope compensation reduces current limit at higher duty cycles. Note 6: Current flows into pin. Note 7: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed the maximum operating junction temperature range when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Operating Voltage, VIN1 l 3.4 3.7 V Minimum Operating Voltage, VIN2 VIN1 = 12V l 2.5 3.0 V VIN1 Quiescent Current Not Switching 4.3 5.2 mA VIN2 Quiescent Current Not Switching 320 500 μA Shutdown Current (VIN1 + VIN2)VSHDN = 0.3V 0.1 2 μA FB Voltage l 0.790 0.784 0.800 0.814 0.816 V V FB Pin Bias Current (Note 3) VFB = 0.800V, VC = 0.4V l 50 300 nA FB Voltage Line Regulation 5V < VIN < 40V 0.01 %/V Error Amp Transconductance 300 μS Error Amp Voltage Gain 600 V/V VC to Switch Current Gain 2.5 A/V Switching Frequency RT = 33.2k l 0.92 1 1.06 MHz Switching Phase RT = 33.2k 150 180 210 Deg Maximum Duty Cycle (Note 4) RT = 33.2k RT = 7.50k RT = 169k l 84 90 80 98 % % % Foldback Frequency RT = 33.2k, VFB = 0V 120 kHz Switch Current Limit (Note 5) Duty Cycle = 15% l 2.0 2.6 3.2 A Switch VCESAT ISW = 1.5A 300 mV Switch Leakage Current 0.01 1 μA Minimum Boost Voltage 1.7 2.5 V Boost Pin Current ISW = 1.5A 35 50 mA TRACK/SS Pin Current VTRACK/SS = 0V 0.8 1.2 2.2 μA PG Threshold Offset VFB Rising 56 75 110 mV PG Voltage Output Low VFB = 0.6V, IPG = 250μA 0.13 0.4 V PG Pin Leakage VPG = 2V 0.01 1 μA SHDN Threshold Voltage 2.53 2.63 2.73 V SHDN Input Current (Note 6) VSHDN = 60mV Above Threshold Voltage 6 8 10 μA SHDN Threshold Current Hysteresis 5.5 7.5 9.5 μA SYNC Threshold Voltage 1 1.25 1.5 V SYNC Input Frequency 0.25 2.5 MHz |
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